Chapter 23: Subtraction Facts to 10
Learn Grade 1 mathematics from very beginner explanations through worked examples, practice, reasoning, and review.
Chapter Overview
This chapter teaches Subtraction Facts to 10 with simple language, step-by-step reasoning, and original worked examples. Math words are explained in simple Grade 1 language.
Key Technical Terms
- Subtracting 0 (a Grade 1 idea used in this chapter)
- Subtracting 1 (a Grade 1 idea used in this chapter)
- Subtracting all (a Grade 1 idea used in this chapter)
- Subtracting from 5 (a Grade 1 idea used in this chapter)
- Subtracting from 10 (a Grade 1 idea used in this chapter)
- Fact families within 10 (a Grade 1 idea used in this chapter)
- Missing parts in subtraction (a Grade 1 idea used in this chapter)
- Using addition to check subtraction (a Grade 1 idea used in this chapter)
- Subtraction word stories (a Grade 1 idea used in this chapter)
- Subtraction facts review (a Grade 1 idea used in this chapter)
How to Learn This Chapter
Read or listen to the explanation, use objects or pictures when helpful, follow one step at a time, and try the example again before checking the answer.
23.1 Subtracting 0
Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Subtracting 0 mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Subtracting 0.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Subtracting 0.
Worked Example 3
Problem: Which tool could help with Subtracting 0?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Subtracting 0?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Subtracting 0 in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting 0 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Subtracting 0. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.2 Subtracting 1
Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Subtracting 1 mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Subtracting 1.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Subtracting 1.
Worked Example 3
Problem: Which tool could help with Subtracting 1?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Subtracting 1?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Subtracting 1 in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting 1 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Subtracting 1. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.3 Subtracting all
Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Subtracting all mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Subtracting all.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Subtracting all.
Worked Example 3
Problem: Which tool could help with Subtracting all?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Subtracting all?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Subtracting all in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting all can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Subtracting all. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.4 Subtracting from 5
Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Subtracting from 5 mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Subtracting from 5.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Subtracting from 5.
Worked Example 3
Problem: Which tool could help with Subtracting from 5?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Subtracting from 5?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Subtracting from 5 in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting from 5 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Subtracting from 5. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.5 Subtracting from 10
Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Subtracting from 10 mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Subtracting from 10.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Subtracting from 10.
Worked Example 3
Problem: Which tool could help with Subtracting from 10?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Subtracting from 10?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Subtracting from 10 in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtracting from 10 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Subtracting from 10. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.6 Fact families within 10
Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Fact families within 10 mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Answer: Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Worked Example 2
Problem: Show one small example of Fact families within 10.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Answer: A correct small model or drawing can show the meaning of Fact families within 10.
Worked Example 3
Problem: Which tool could help with Fact families within 10?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Fact families within 10?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Fact families within 10 in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Answer: Fact families within 10 can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Show Fact families within 10 with a simple Grade 1 example.
- Use small numbers, objects, or a drawing.
- Explain what the example shows.
Very beginner explanation: Grade 1 learners understand Fact families within 10 best through concrete examples and clear words.
Answer: A correct simple example of Fact families within 10.
Worked Example 7
Problem: Show Fact families within 10 with a simple Grade 1 example.
- Use small numbers, objects, or a drawing.
- Explain what the example shows.
Very beginner explanation: Grade 1 learners understand Fact families within 10 best through concrete examples and clear words.
Answer: A correct simple example of Fact families within 10.
Worked Example 8
Problem: Show Fact families within 10 with a simple Grade 1 example.
- Use small numbers, objects, or a drawing.
- Explain what the example shows.
Very beginner explanation: Grade 1 learners understand Fact families within 10 best through concrete examples and clear words.
Answer: A correct simple example of Fact families within 10.
Worked Example 9
Problem: Show Fact families within 10 with a simple Grade 1 example.
- Use small numbers, objects, or a drawing.
- Explain what the example shows.
Very beginner explanation: Grade 1 learners understand Fact families within 10 best through concrete examples and clear words.
Answer: A correct simple example of Fact families within 10.
Worked Example 10
Problem: Show Fact families within 10 with a simple Grade 1 example.
- Use small numbers, objects, or a drawing.
- Explain what the example shows.
Very beginner explanation: Grade 1 learners understand Fact families within 10 best through concrete examples and clear words.
Answer: A correct simple example of Fact families within 10.
Practice Exercise
Create one small question about Fact families within 10. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.7 Missing parts in subtraction
Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Missing parts in subtraction mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Missing parts in subtraction.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Missing parts in subtraction.
Worked Example 3
Problem: Which tool could help with Missing parts in subtraction?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Missing parts in subtraction?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Missing parts in subtraction in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Missing parts in subtraction can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Missing parts in subtraction. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.8 Using addition to check subtraction
Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Using addition to check subtraction mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Answer: Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Worked Example 2
Problem: Show one small example of Using addition to check subtraction.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Answer: A correct small model or drawing can show the meaning of Using addition to check subtraction.
Worked Example 3
Problem: Which tool could help with Using addition to check subtraction?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Using addition to check subtraction?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Using addition to check subtraction in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Answer: Using addition to check subtraction can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 2 + 3.
- Make a group of 2.
- Add 3 more.
- Count all the objects.
Very beginner explanation: Addition puts quantities together.
Answer: 5
Worked Example 7
Problem: Find 4 + 1.
- Make a group of 4.
- Add 1 more.
- Count all the objects.
Very beginner explanation: Addition puts quantities together.
Answer: 5
Worked Example 8
Problem: Find 5 + 2.
- Make a group of 5.
- Add 2 more.
- Count all the objects.
Very beginner explanation: Addition puts quantities together.
Answer: 7
Worked Example 9
Problem: Find 6 + 3.
- Make a group of 6.
- Add 3 more.
- Count all the objects.
Very beginner explanation: Addition puts quantities together.
Answer: 9
Worked Example 10
Problem: Find 8 + 2.
- Make a group of 8.
- Add 2 more.
- Count all the objects.
Very beginner explanation: Addition puts quantities together.
Answer: 10
Practice Exercise
Create one small question about Using addition to check subtraction. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.9 Subtraction word stories
Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Subtraction word stories mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Subtraction word stories.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Subtraction word stories.
Worked Example 3
Problem: Which tool could help with Subtraction word stories?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Subtraction word stories?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Subtraction word stories in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtraction word stories can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Subtraction word stories. Show it with objects, a picture, or numbers, then check by counting or comparing again.
23.10 Subtraction facts review
Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Beginner Note
Start with real objects, fingers, or a picture. Say the idea aloud, try one small example, and check it by counting or comparing again.
10 Worked Examples with Answers and Very-Beginner Explanations
Worked Example 1
Problem: What does Subtraction facts review mean?
- Say the topic in simple words.
- Use objects, fingers, a drawing, or a number example.
- Tell what you notice.
Very beginner explanation: Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Worked Example 2
Problem: Show one small example of Subtraction facts review.
- Choose small numbers or a simple shape/object.
- Make a model or drawing.
- Describe what the model shows.
Very beginner explanation: Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: A correct small model or drawing can show the meaning of Subtraction facts review.
Worked Example 3
Problem: Which tool could help with Subtraction facts review?
- Think about counters, fingers, a ten frame, number line, picture, table, or real object.
- Choose the tool that makes the idea easiest to see.
Very beginner explanation: Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Use a simple tool that lets you see and check the quantities or shapes.
Worked Example 4
Problem: How can you check your work in Subtraction facts review?
- Look at the objects, drawing, or numbers again.
- Count or compare one more time.
- Make sure the answer matches the question.
Very beginner explanation: Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Check by recounting, comparing, or using a second simple model.
Worked Example 5
Problem: Where might you use Subtraction facts review in everyday life?
- Think about toys, snacks, books, classroom objects, calendars, shapes, or money.
- Choose one situation.
- Explain how the math helps.
Very beginner explanation: Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Answer: Subtraction facts review can help with a simple everyday task such as counting, sharing, comparing, measuring, organizing, or deciding.
Worked Example 6
Problem: Find 5 - 2.
- Start with 5 objects.
- Take away 2.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 3
Worked Example 7
Problem: Find 7 - 3.
- Start with 7 objects.
- Take away 3.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 8
Problem: Find 9 - 4.
- Start with 9 objects.
- Take away 4.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 5
Worked Example 9
Problem: Find 10 - 6.
- Start with 10 objects.
- Take away 6.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 4
Worked Example 10
Problem: Find 14 - 5.
- Start with 14 objects.
- Take away 5.
- Count what is left.
Very beginner explanation: Subtraction tells how many are left or the difference.
Answer: 9
Practice Exercise
Create one small question about Subtraction facts review. Show it with objects, a picture, or numbers, then check by counting or comparing again.
Chapter Notes, Practice, and Common Mistakes
Chapter Notes
- Read or listen to the question before solving.
- Use objects, a drawing, ten frame, number line, table, graph, or simple number sentence when useful.
- Explain your thinking and check by counting, comparing, or using another simple model.
Extra Practice
- Create and solve one original problem about Subtracting 0.
- Create and solve one original problem about Subtracting 1.
- Create and solve one original problem about Subtracting all.
- Create and solve one original problem about Subtracting from 5.
- Create and solve one original problem about Subtracting from 10.
- Create and solve one original problem about Fact families within 10.
Common Mistakes
- Skipping the meaning and trying to memorize a rule only.
- Using the wrong operation because the question was not read completely.
- Ignoring units, labels, place values, or the context of the problem.
- Not estimating or checking whether the final answer is reasonable.
30 Review Questions and Answers
Q1. What is the main idea in Subtracting 0?
Answer: Subtracting 0 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q2. What is the main idea in Subtracting 1?
Answer: Subtracting 1 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q3. What is the main idea in Subtracting all?
Answer: Subtracting all teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q4. What is the main idea in Subtracting from 5?
Answer: Subtracting from 5 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q5. What is the main idea in Subtracting from 10?
Answer: Subtracting from 10 teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q6. What is the main idea in Fact families within 10?
Answer: Fact families within 10 is a Grade 1 mathematics idea. Learn it with objects or pictures first, then explain it with numbers or words.
Q7. What is the main idea in Missing parts in subtraction?
Answer: Missing parts in subtraction teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q8. What is the main idea in Using addition to check subtraction?
Answer: Using addition to check subtraction teaches how to put quantities together. Learners use objects, drawings, ten frames, and counting-on strategies before writing number sentences.
Q9. What is the main idea in Subtraction word stories?
Answer: Subtraction word stories teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q10. What is the main idea in Subtraction facts review?
Answer: Subtraction facts review teaches how to take away or find what is left. Learners use objects, drawings, and counting strategies to make the meaning clear.
Q11. Why is it useful to use counters or drawings?
Answer: They make the quantities visible and help you understand before using only numbers.
Q12. Why should you count carefully?
Answer: Careful counting means each object is counted once and no object is missed.
Q13. What can you do if a problem feels hard?
Answer: Use smaller numbers, draw a picture, use objects, and solve one small step at a time.
Q14. Why should both sides of an equals sign match?
Answer: The equals sign means the two sides have the same value.
Q15. How can a number line help?
Answer: It shows number order and can help you count forward or backward.
Q16. How can a ten frame help?
Answer: It organizes objects into groups that make numbers and addition easier to see.
Q17. Why are equal shares important?
Answer: Equal shares make fair groups or equal parts.
Q18. How do patterns help us predict?
Answer: A pattern rule tells us what should come next.
Q19. Why do we label a graph or table?
Answer: Labels tell us what the information represents.
Q20. How can you describe a shape?
Answer: Talk about its sides, corners, flat or curved surfaces, and other visible attributes.
Q21. How can you compare two objects?
Answer: Choose one attribute, such as length, mass, or capacity, and compare that same attribute.
Q22. Why is a calendar useful?
Answer: It organizes days, weeks, months, dates, and events.
Q23. Why does money have different values?
Answer: Different coins and bills represent different amounts of money.
Q24. Why should you explain your answer?
Answer: Explaining shows how you thought about the problem and helps you check your reasoning.
Q25. What should you do after a mistake?
Answer: Look at the step again, fix it, and try a similar example.
Q26. How can you be a confident math learner?
Answer: Use positive self-talk, try a strategy, ask questions, and remember that mistakes help you learn.
Q27. When should you use a picture?
Answer: Use a picture when it helps you see quantities, shapes, positions, or a story problem.
Q28. When should you use objects?
Answer: Use objects when you want to count, join, take away, share, sort, or compare in a hands-on way.
Q29. How can you check addition?
Answer: Recount the combined objects or use another model.
Q30. How can you check subtraction?
Answer: Put the taken-away part and the part left back together to see if they make the starting amount.